2128647 has 16 divisors (see below), whose sum is σ = 2957312. Its totient is φ = 1360800.

The previous prime is 2128631. The next prime is 2128649. The reversal of 2128647 is 7468212.

It is not a de Polignac number, because 2128647 - 2⁴ = 2128631 is a prime.

It is a super-2 number, since 2×2128647² = 9062276101218, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14022 + ... + 14172.

It is an arithmetic number, because the mean of its divisors is an integer number (184832).

2^2128647 is an apocalyptic number.

2128647 is a deficient number, since it is larger than the sum of its proper divisors (828665).

2128647 is a wasteful number, since it uses less digits than its factorization.

2128647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318.

The product of its digits is 5376, while the sum is 30.

The square root of 2128647 is about 1458.9883481372. The cubic root of 2128647 is about 128.6375862343.

It can be divided in two parts, 2128 and 647, that added together give a triangular number (2775 = T₇₄).

The spelling of 2128647 in words is "two million, one hundred twenty-eight thousand, six hundred forty-seven".